My brother met the actor who played him one time while working at a small gas station in Gila Bend, AZ. Said he was a really nice guy. That would have been in '79 - dont have a clue what happened to him after that.
Dan Haggerty is still alive and still acting in B-movies and made-for-television movies for the most part.
I believe Grizzly Adams was eventually cleared of the murder charges but chose to return to his mountain with Ben and Mad Jack. Eventually Grizzly Adams created a lure and named it after Mad Jack in a strangely metrosexual twist to the television series.
Dan Haggerty, the actor from Grizzly Adams was on the HBO series Cat House or something like that the other night. The show about the whorehouse outside of Vegas. Looked like he was having a good time. Didn't see any bears, lots of beaver but no bear.